title: Precancerous lesions in inflammatory bowel disease.
abstract: Reduction of mortality from colorectal cancer is a prime goal in the clinical management of patients with extensive, longstanding ulcerative colitis and colonic Crohn's disease. The cornerstone of current cancer prevention efforts is endoscopic surveillance for colorectal dysplasia, or intraepithelial neoplasia, the direct histological precursor of cancer. A diagnosis of dysplasia provides a reliable indicator of heightened cancer risk and an end-point for colonoscopic surveillance allowing most patients to undergo prophylactic colectomy before the development of incurable cancer. This article reviews the classification, pathological criteria and clinical implications of colorectal dysplasia, current recommendations for the performance of surveillance colonoscopy, recent technical advances in colonoscopic imaging to enhance the detection of dysplasia, and a summary of the molecular genetic events implicated in its development.
authors.affiliation: Department of Pathology, Icahn School of Medicine at Mount Sinai, 1468 Madison Avenue, New York, NY 10029, USA. noam.harpaz@mountsinai.org
authors.forename: Noam
authors.initials: N
authors.lastname: Harpaz
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Ward
authors.forename: Claudia
authors.initials: C
authors.lastname: Mescoli
authors.forename: Steven H
authors.initials: SH
authors.lastname: Itzkowitz
authors.forename: Alexandros D
authors.initials: AD
authors.lastname: Polydorides
mesh_terms: D002278:Carcinoma in Situ / Q000175:diagnosis*; D003093:Colitis, Ulcerative / Q000175:diagnosis; D003113:Colonoscopy; D003424:Crohn Disease / Q000175:diagnosis; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000175:diagnosis*; D011230:Precancerous Conditions / Q000175:diagnosis*